Half of his eight to henky thomas



I (No Model.)

0. H. PERKINS. Electric Annunciator.

' Patented May 18,1880.

Z a #12444 Jim 'N-PETERS, PNOTO-LITHOGRAPHER. WASHINGTON. D. c.

UNITED: STATES PATENT OFFICE.

CLAYTON H. PERKINS, ()FHOLYOKE, MASSACHUSETTS, ASSIGNOR OF ONE- HALF OFHISRIGHT- TO HENRY THOMAS, OF SAME PLACE.

ELECTRIC ANNUNCIATOR.

SPECIFICATION forming part of Letters Patent No. 227,704, dated May 18,1880.

Application filed March 10, 1880. (No model.)

To all whom it may concern:

Be it known that I, CLAYTON H. PERKINS, a citizen of the United States,residing at Holyoke, in the county of Hampden and State ofMassachusetts, have invented new and useful Improvements inElectro-Magnetic Annunciators, of which the following is aspecification.

My invention relates to that class of annunciators, used in hotels andother similar places, To which are operated by electric impulses; andthe object of my invention is the production of an improved annunciatorof this class which is operated by a weak current of electricity, whichcauses an alarm-bell to be rung otherwise than by the action of anelectric current upon vibrating armatures, and which is of simple andinexpensive construction.

I attain these objects by the mechanism illustrated in the -accompanyingdrawings, in which- 7 Figure l is a front elevation, showing a portionof an annunciator-case and the parts connected with a singleannunciator. Fig. 2 is an edge elevation of said portion of acase,partly in section, and showing the annunciator-plate disengaged from themagnet.

In annunciators of this class as heretofore constructed their operationhas required quite a strong electric current, as well for disengag- 0ing the annunciator-cover as for ringing the bell, and the failure tomaintain a current of considerable strength would result in renderingthe apparatus inoperative; also, the construction of such'annunciatorshas been com- 5 paratively expensive.

My improved construction, as herein shown and described, is adapted tobe controlled by a very weak electric current, is effective in itsoperation, and can be constructed at small ex- 0 pense.

The case partA is adaptedto the reception, within a cavity formed'in oneside of it, as shown, of an electro-magnet, B, consisting of a singleshort bobbin and core, as seen in Fig.

I 5 2, said bobbin being secured within said cavity by a screw throughthe back of said case, as shown. The bobbin is adapted to fillsaidcavity, leaving the outer end of the core of the magnet to projectsomewhat beyond the face of the case. The ends of the wire wound uponthe magnet B are led therefrom, one to a connection-post, c, as shown bya dotted line, Fig. 1, and one to a hook, d,-(shown also by a dottedline on the same figure.) Said hook at is secured to the face. of caseA, and projects therefrom, as seen in Fig. 2. Secured on case A, beneatha second connection-post, b, is a spring-lever, h, its end having apress-buttonon it, as shown, and resting against the under side of hookd. To the posts I) c are connected the line-wires w 00. Below the magnetB, on case A, is pivoted the annunciator-plate D, adapted to oscillateina plane parallel to the face of case A, on a pivot, e, which passesthrough the lower end of said plate D, and is secured between a suitablebearing-point on the face of case A and an arm, '5, reaching. out fromsaid case. On an upper corner of plate D is fixed a ball, 0, and fixedon its face next to the magnet B is a metallic block, a, and near itslower end, a little to one side of the center, is fixed a secondmetallic block, 0).

(Both shown in dotted lines in Fig. 1.) Located on the face of case A,in such a position that plate D, swinging on its pivot 0, will strikeagainst it and cause it to ring, is a bell, H.

The operation of my annunciator is as follows, viz: Connection is madewith a battery by the line-wires w, and the course of the current ofelectricity is through post 0, thence around the magnet B to hook d,through springlever h, to post I), to the line-wire. This connectionhaving been made, if plate D be swung up into the position shown in Fig.1, bringing block it against the side of the projecting end of the coreof the electro-magnet B, magnetic attraction will cause plate B toremain in said upright position so long as the said circuit remainsunbroken; but if the end of lever h be pushed away from its contact withhook d the magnetic current is interrupted, and plate D drops instantlyaway from magnet B, swingin g with considerable force on its pivot c,and, striking bell H, causes it to ring and call attention to theannunciator; but if said bell be not heard the position of plate D,hanging away from the magnet, would indicate a call. The position ofblocks a and 'u on plate D, one

side of its vertical center line, and the ball 0, which strikes againstthe bell, all assist to make the fall of said plate quite rapid enoughto cause it to ring bell H distinctly.

The nicely-balanced position of plate D on its pivot, when held againstthe magnet in an upright position, requires but a very slight magneticcurrent, and insures the proper operation of the annunciat-or at theslightest interruption thereof.

The manner of breaking the circuit herein shown illustratessubstantially a circuit-breaker which may be located and operated at anyconvenient point on a line with which my annunciator may be connected.

The plate D may be hinged in front of magnet B, and adapted to fall awaytherefrom upon CLAYTON H. PERKINS.

Witnesses:

WM. H. OHAPIN, M. A. LEE.

